forked from mirrors/gecko-dev
230 lines
9.2 KiB
C++
230 lines
9.2 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* internal abstract interface for containers (roughly origins within
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* the CSS cascade) that provide style rules matching an element or
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* pseudo-element
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*/
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#ifndef nsIStyleRuleProcessor_h___
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#define nsIStyleRuleProcessor_h___
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#include <stdio.h>
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#include "nsISupports.h"
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#include "nsPresContext.h" // for nsCompatability
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#include "nsILinkHandler.h"
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#include "nsString.h"
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#include "nsChangeHint.h"
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class nsIStyleSheet;
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class nsPresContext;
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class nsIContent;
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class nsIAtom;
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class nsICSSPseudoComparator;
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class nsRuleWalker;
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class nsAttrValue;
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// The implementation of the constructor and destructor are currently in
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// nsCSSRuleProcessor.cpp.
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struct RuleProcessorData {
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RuleProcessorData(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsRuleWalker* aRuleWalker,
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nsCompatibility* aCompat = nsnull);
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// NOTE: not |virtual|
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~RuleProcessorData();
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void* operator new(size_t sz, nsPresContext* aContext) CPP_THROW_NEW {
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return aContext->AllocateFromShell(sz);
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}
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void Destroy(nsPresContext* aContext) {
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this->~RuleProcessorData();
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aContext->FreeToShell(sizeof(RuleProcessorData), this);
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}
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const nsString* GetLang();
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nsPresContext* mPresContext;
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nsIContent* mContent; // weak ref
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nsIContent* mParentContent; // if content, content->GetParent(); weak ref
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nsRuleWalker* mRuleWalker; // Used to add rules to our results.
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nsIContent* mScopedRoot; // Root of scoped stylesheet (set and unset by the supplier of the scoped stylesheet
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nsIAtom* mContentTag; // if content, then content->GetTag()
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nsIAtom* mContentID; // if styled content, then weak reference to styledcontent->GetID()
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PRPackedBool mIsHTMLContent; // if content, then does QI on HTMLContent, true or false
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PRPackedBool mIsLink; // if content, calls nsStyleUtil::IsHTMLLink or nsStyleUtil::IsLink
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PRPackedBool mHasAttributes; // if content, content->GetAttrCount() > 0
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nsCompatibility mCompatMode; // Possibly remove use of this in SelectorMatches?
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nsLinkState mLinkState; // if a link, this is the state, otherwise unknown
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PRInt32 mEventState; // if content, eventStateMgr->GetContentState()
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PRInt32 mNameSpaceID; // if content, content->GetNameSapce()
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const nsAttrValue* mClasses; // if styled content, styledcontent->GetClasses()
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// mPreviousSiblingData and mParentData are always RuleProcessorData
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// and never a derived class. They are allocated lazily, when
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// selectors require matching of prior siblings or ancestors.
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RuleProcessorData* mPreviousSiblingData;
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RuleProcessorData* mParentData;
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protected:
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nsAutoString *mLanguage; // NULL means we haven't found out the language yet
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};
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struct ElementRuleProcessorData : public RuleProcessorData {
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ElementRuleProcessorData(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsRuleWalker* aRuleWalker)
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: RuleProcessorData(aPresContext,aContent,aRuleWalker)
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{
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NS_PRECONDITION(aContent, "null pointer");
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NS_PRECONDITION(aRuleWalker, "null pointer");
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}
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};
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struct PseudoRuleProcessorData : public RuleProcessorData {
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PseudoRuleProcessorData(nsPresContext* aPresContext,
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nsIContent* aParentContent,
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nsIAtom* aPseudoTag,
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nsICSSPseudoComparator* aComparator,
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nsRuleWalker* aRuleWalker)
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: RuleProcessorData(aPresContext, aParentContent, aRuleWalker)
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{
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NS_PRECONDITION(aPseudoTag, "null pointer");
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NS_PRECONDITION(aRuleWalker, "null pointer");
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mPseudoTag = aPseudoTag;
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mComparator = aComparator;
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}
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nsIAtom* mPseudoTag;
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nsICSSPseudoComparator* mComparator;
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};
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struct StateRuleProcessorData : public RuleProcessorData {
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StateRuleProcessorData(nsPresContext* aPresContext,
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nsIContent* aContent,
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PRInt32 aStateMask)
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: RuleProcessorData(aPresContext, aContent, nsnull),
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mStateMask(aStateMask)
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{
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NS_PRECONDITION(aContent, "null pointer");
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}
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const PRInt32 mStateMask; // |HasStateDependentStyle| for which state(s)?
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// Constants defined in nsIEventStateManager.h .
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};
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struct AttributeRuleProcessorData : public RuleProcessorData {
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AttributeRuleProcessorData(nsPresContext* aPresContext,
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nsIContent* aContent,
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nsIAtom* aAttribute,
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PRInt32 aModType,
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PRUint32 aStateMask)
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: RuleProcessorData(aPresContext, aContent, nsnull),
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mAttribute(aAttribute),
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mModType(aModType),
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mStateMask(aStateMask)
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{
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NS_PRECONDITION(aContent, "null pointer");
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}
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nsIAtom* mAttribute; // |HasAttributeDependentStyle| for which attribute?
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PRInt32 mModType; // The type of modification (see nsIDOMMutationEvent).
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PRUint32 mStateMask; // The states that changed with the attr change.
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};
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// IID for the nsIStyleRuleProcessor interface {015575fe-7b6c-11d3-ba05-001083023c2b}
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#define NS_ISTYLE_RULE_PROCESSOR_IID \
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{0x015575fe, 0x7b6c, 0x11d3, {0xba, 0x05, 0x00, 0x10, 0x83, 0x02, 0x3c, 0x2b}}
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/* The style rule processor interface is a mechanism to separate the matching
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* of style rules from style sheet instances.
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* Simple style sheets can and will act as their own processor.
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* Sheets where rule ordering interlaces between multiple sheets, will need to
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* share a single rule processor between them (CSS sheets do this for cascading order)
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*
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* @see nsIStyleRule (for significantly more detailed comments)
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*/
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class nsIStyleRuleProcessor : public nsISupports {
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISTYLE_RULE_PROCESSOR_IID)
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// Shorthand for:
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// nsCOMArray<nsIStyleRuleProcessor>::nsCOMArrayEnumFunc
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typedef PRBool (* PR_CALLBACK EnumFunc)(nsIStyleRuleProcessor*, void*);
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/**
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* Find the |nsIStyleRule|s matching the given content node and
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* position the given |nsRuleWalker| at the |nsRuleNode| in the rule
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* tree representing that ordered list of rules (with higher
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* precedence being farther from the root of the lexicographic tree).
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*/
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NS_IMETHOD RulesMatching(ElementRuleProcessorData* aData) = 0;
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/**
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* Just like the previous |RulesMatching|, except for a given content
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* node <em>and pseudo-element</em>.
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*/
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NS_IMETHOD RulesMatching(PseudoRuleProcessorData* aData) = 0;
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/**
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* Return how (as described by nsReStyleHint) style can depend on a
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* change of the given content state on the given content node. This
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* test is used for optimization only, and may err on the side of
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* reporting more dependencies than really exist.
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*
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* Event states are defined in nsIEventStateManager.h.
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*/
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NS_IMETHOD HasStateDependentStyle(StateRuleProcessorData* aData,
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nsReStyleHint* aResult) = 0;
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/**
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* Return how (as described by nsReStyleHint) style can depend on the
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* presence or value of the given attribute for the given content
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* node. This test is used for optimization only, and may err on the
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* side of reporting more dependencies than really exist.
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*/
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NS_IMETHOD HasAttributeDependentStyle(AttributeRuleProcessorData* aData,
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nsReStyleHint* aResult) = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIStyleRuleProcessor,
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NS_ISTYLE_RULE_PROCESSOR_IID)
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#endif /* nsIStyleRuleProcessor_h___ */
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